Resonant and non-resonant behaviour of a flexibly mounted cylinder in waves

Numerical Study of the Flow Pattern and the in-Line Response of a Flexible Cylinder in an Oscillating Stream

“…An approximate solution of the in-line response of a flexible cylinder based on the linearized equations of motion has been given by Blevins (1977). McConnel & Park (1982), Bearman & Hall (1987), Maull & Kaye (1988), Borthwick & Herbert (1990), Bearman & Mackwood (1991), Bearman et al (1992) and Lipsett & Williamson (1994) conducted experiments on the hydrodynamic response of compliant cylinders in oscillating and wave flow. The cylinder was free to move in the streamwise direction, transversely to the incident flow, or in both directions.…”

Numerical simulation of vibration of horizontal cylinder induced by progressive waves

“…Evans et al (1979) reported findings from these laboratory tests which demonstrated that a submerged circular cylinder could be quite efficient in absorbing energy from a regular wave train. In a study related to the vibrations of structural elements in offshore platform substructures, Borthwick and Herbert (1990) explored the resonant and non-resonant behaviour of a spring-mounted vertical cylinder in waves using a laboratory flume, and established that peak values of force coefficients and response amplitudes occurred when the ratio of wave frequency to cylinder natural frequency in water was an integer submultiple. Koji and Yoshiho (1996) visualized the flow patterns in the vicinity of a stationary horizontal cylinder at low Keulegan-Carpenter (KC) numbers (where KC=U m T/D, with U m being the amplitude of the sinusoidal undisturbed flow velocity, T the oscillation period, and D the diameter of the cylinder), the aim being to ascertain the loading mechanism due to circulation.…”